TL;DR: A dry, hacking cough followed by a gag is often a sign of kennel cough and usually requires a vet visit within 24-48 hours, or immediately if breathing is labored. Recording a video of the episode can significantly help your veterinarian reach an accurate diagnosis.
What causes my dog to have a dry, hacking cough that ends in a gag?
When a dog experiences a dry, hacking cough that finishes with a gagging or retching sound, it is often referred to as a terminal retch. This specific sound can be alarming and frequently makes pet owners think their dog has something stuck in their throat. In many cases, this is a hallmark sign of infectious tracheobronchitis, commonly known as kennel cough, but it can also be caused by tracheal collapse, heart disease, or environmental irritants.
When is a dry hacking cough considered a veterinary emergency?
- The urgency level for a dry hacking cough is typically medium; schedule an appointment with your veterinarian within 24 to 48 hours if your dog is still active, eating well, and has pink gums.
- This becomes a high-priority emergency if your dog is struggling to breathe or has blue or purple-tinged gums.
- Seek immediate veterinary care if your dog is lethargic or if the coughing is constant and preventing rest.
How can a video of my dog's cough help the veterinarian?
- Capturing a video is incredibly helpful because dogs rarely perform their cough on command in the exam room.
- A video allows the vet to distinguish between a true cough, a gag, or a "reverse sneeze."
- Seeing the posture and hearing the specific sound helps the vet determine if the issue is likely upper respiratory, cardiac, or an airway obstruction, leading to a faster diagnosis.
Clinical Context (Merck Veterinary Manual)
The prominent clinical sign is paroxysms of harsh, dry coughing, which may be followed by retching and gagging. The cough is easily induced by gentle palpation of the larynx or trachea. Development of more severe signs, including fever, purulent nasal discharge, depression, anorexia, and a productive cough, especially in puppies, indicates a complicating systemic infection such as distemper or bronchopneumonia. Tracheal trauma secondary to intubation may produce a similar, but generally less severe syndrome. Thoracic radiographs are essential to determine the severity of disease and to exclude other causes of cough. Tracheobronchitis should be suspected whenever the characteristic cough suddenly develops 5-10 days after exposure to other susceptible or affected dogs; severity usually diminishes during the first 5 days, but the disease persists for 10-20 days. Bordetella bronchiseptica may act as a primary pathogen, especially in dogs <6 months old; however, it and other bacteria (usually gram-negative organisms such as Pseudomonas sp, Escherichia coli, and Klebsiella pneumoniae) may cause secondary infections after viral injury to the respiratory tract.
Chapter: Infectious Disease, Respiratory
Source: The Merck Veterinary Manual, 11th Edition (Page 1492)